MATLAB: What does Undefined operator ‘-‘ for input arguments of type ‘string’ mean

errorMATLABscript

Hi, I am a beginner user of Matlab. I keep getting " Undefined operator '-' for input arguments of type 'string'", and I have no idea how I need to fix my script. Appreciate any help resolving this issue.

Below is my script:

%NDVI = (infrared - red)./(infrared + red);
NDVIs= ("subplots(299,:)"-"subplots(195,;)")./("subplots(299,:)"+"subplots(195,:)");

Error message:

Undefined operator '-' for input arguments of type 'string'.
Error in Exercise_NDVI (line 2)
NDVIs= ("subplots(299,:)"-"subplots(195,;)")./("subplots(299,:)"+"subplots(195,:)");

Best Answer

NDVIs = (subplots(299,:)-subplots(195,:))./(subplots(299,:)+subplots(195,:));

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MATLAB: Help!!! I keep getting error message “Array indices must be positive integers or logical values.”

Perhaps you mean this:

t = [0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520];
v = [0 139 298 433 685 1026 1279 1373 1490 1634 1800 1986 2191 2417 2651 2915 3303 3516 3860 4216 4630 5092 5612 6184 6760 7327 7581];
for k = 1 : length(t) - 1
	h = t(k + 1) - t(k);
	Dforward(k)= (v(k+1) - v(k)) / h;
end
% Plot original signal
subplot(2, 1, 1);
plot(t, v, 'b.-', 'MarkerSize', 30, 'LineWidth', 2);
grid on
xlabel('t', 'FontSize', 20);
ylabel('v', 'FontSize', 20);
title('v vs. t', 'FontSize', 20);
% Plot Dforward.
subplot(2, 1, 2);
plot(t(1:end-1), Dforward, 'b.-', 'MarkerSize', 30, 'LineWidth', 2);
grid on
xlabel('t', 'FontSize', 20);
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MATLAB: Set figure properties ‘String’

For uicontrol of style 'text', the String property is what is displayed in the uicontrol text area. For style 'edit', the String property is the text that is initially placed in the uicontrol edit area. For style 'radio' or 'push' or 'checkbox, the String property is the label to display. For 'list' or 'popup', the String property is the entries to put into the menus. In short, for uicontrol, the String property is something to display to the user.

For text() graphic objects, the String property is the text to be plotted.

Best Answer

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MATLAB: Help!!! I keep getting error message “Array indices must be positive integers or logical values.”

MATLAB: Set figure properties ‘String’

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